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  <nav class="navbar navbar-expand-md bg-primary navbar-dark">
    <div class="container">
      <a class="navbar-brand" href="#"><i class="fa d-inline fa-lg fa-cloud"></i><b>&nbsp;Home</b></a>
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbar2SupportedContent" aria-controls="navbar2SupportedContent" aria-expanded="false"
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        <ul class="navbar-nav"></ul>
        <a class="btn navbar-btn ml-2 text-white btn-secondary" href="register/"><i class="fa d-inline fa-lg fa-user-circle-o"></i> Sign up</a>
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        <a class="btn navbar-btn ml-2 text-white btn-secondary" href="company/"><i class="fa d-inline fa-lg fa-user-circle-o"></i> company</a>
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    <div class="container">
      <div class="row">
        <div class="p-4 col-md-3"> <i class="d-block fa fa-3x fa-pie-chart"></i>
          <h2 class="my-3">公司管理</h2>
          <p>员工信息
            <br>入账记录</p>
        </div>
        <div class="col-md-3 p-4"> <i class="d-block fa fa-3x fa-th"></i>
          <h2 class="my-3">普通用户</h2>
          <p>在线填写寄件信息
            <br>查询包裹信息</p>
        </div>
        <div class="col-md-3 p-4"> <i class="d-block fa fa-3x fa-globe"></i>
          <h2 class="my-3">公司职员</h2>
          <p>个人工作进度</p>
        </div>
        <div class="col-md-3 p-4"> <i class="d-block fa fa-3x fa-money"></i>
          <h2 class="my-3">系统介绍</h2>
          <p>面向小型物流公司的物流管理系统，针对三种不同的用户提供不同的使用方式</p>
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